// Copyright © 2017 NAME HERE <EMAIL ADDRESS>
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cmd

import (
	"fmt"
	"os/signal"
	"syscall"

	"os"

	"github.com/spf13/cobra"
)

// rootCmd represents the root command
var rootCmd = &cobra.Command{
	Use:   "root",
	Short: "A brief description of your command",
	Long: `A longer description that spans multiple lines and likely contains examples
and usage of using your command. For example:

Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
	Run: func(cmd *cobra.Command, args []string) {
		fmt.Println("root called")
		c := make(chan os.Signal)
		for {
			s := <-c
			fmt.Println(s)
		}
	},
}

func Execute() {
	go catchSignal()
	if err := rootCmd.Execute(); err != nil {
		fmt.Println("execute err : ", err)
		os.Exit(-1)
	}
}
func setEnvironment() {

}

// 捕捉信号
func catchSignal() {
	c := make(chan os.Signal)
	// todo 配置热更新, windows 不支持 syscall.SIGUSR1, syscall.SIGUSR2
	signal.Notify(c, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
	for {
		s := <-c
		fmt.Println("收到信号 -- ", s)
		switch s {
		case syscall.SIGHUP:
			fmt.Println("收到终端断开信号, 忽略")
		case syscall.SIGINT, syscall.SIGTERM:
			shutdown()
		}
	}
}

// 应用退出
func shutdown() {
	defer func() {
		fmt.Println("已退出")
		os.Exit(0)
	}()

	fmt.Println("应用准备退出")

}
